821935473 has 16 divisors (see below), whose sum is σ = 1106433216. Its totient is φ = 542716160.

The previous prime is 821935453. The next prime is 821935481. The reversal of 821935473 is 374539128.

It is a cyclic number.

It is not a de Polignac number, because 821935473 - 2²⁰ = 820886897 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (821935403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199765 + ... + 203837.

It is an arithmetic number, because the mean of its divisors is an integer number (69152076).

Almost surely, 2^821935473 is an apocalyptic number.

It is an amenable number.

821935473 is a deficient number, since it is larger than the sum of its proper divisors (284497743).

821935473 is a wasteful number, since it uses less digits than its factorization.

821935473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4704.

The product of its digits is 181440, while the sum is 42.

The square root of 821935473 is about 28669.4170327895. The cubic root of 821935473 is about 936.7259998100.

The spelling of 821935473 in words is "eight hundred twenty-one million, nine hundred thirty-five thousand, four hundred seventy-three".